CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
CMAKE_POLICY(VERSION 2.8)

SET(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake" "${CMAKE_MODULE_PATH}")

FIND_PACKAGE(Torch REQUIRED)

# Flags
# When using MSVC
IF(MSVC)
  # we want to respect the standard, and we are bored of those **** .
  ADD_DEFINITIONS(-D_CRT_SECURE_NO_DEPRECATE=1)
ENDIF(MSVC)

# OpenMP support?
SET(WITH_OPENMP ON CACHE BOOL "OpenMP support if available?")
IF (APPLE AND CMAKE_COMPILER_IS_GNUCC)
  EXEC_PROGRAM (uname ARGS -v  OUTPUT_VARIABLE DARWIN_VERSION)
  STRING (REGEX MATCH "[0-9]+" DARWIN_VERSION ${DARWIN_VERSION})
  MESSAGE (STATUS "MAC OS Darwin Version: ${DARWIN_VERSION}")
  IF (DARWIN_VERSION GREATER 9)
    SET(APPLE_OPENMP_SUCKS 1)
  ENDIF (DARWIN_VERSION GREATER 9)
  EXECUTE_PROCESS (COMMAND ${CMAKE_C_COMPILER} -dumpversion
    OUTPUT_VARIABLE GCC_VERSION)
  IF (APPLE_OPENMP_SUCKS AND GCC_VERSION VERSION_LESS 4.6.2)
    MESSAGE(STATUS "Warning: Disabling OpenMP (unstable with this version of GCC)")
    MESSAGE(STATUS " Install GCC >= 4.6.2 or change your OS to enable OpenMP")
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unknown-pragmas")
    SET(WITH_OPENMP OFF CACHE BOOL "OpenMP support if available?" FORCE)
  ENDIF ()
ENDIF ()

IF (WITH_OPENMP)
  FIND_PACKAGE(OpenMP)
  IF(OPENMP_FOUND)
    MESSAGE(STATUS "Compiling with OpenMP support")
    SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
    SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
  ENDIF(OPENMP_FOUND)
ENDIF (WITH_OPENMP)

LINK_DIRECTORIES("${Torch_INSTALL_LIB}")

SET(src init.c)
FILE(GLOB luasrc *.lua)
ADD_TORCH_PACKAGE(gvnn "${src}" "${luasrc}")
TARGET_LINK_LIBRARIES(gvnn luaT TH)


FIND_PACKAGE(CUDA 4.0 REQUIRED)

LIST(APPEND CUDA_NVCC_FLAGS "-arch=sm_20")

INCLUDE_DIRECTORIES("${Torch_INSTALL_INCLUDE}/THC")
SET(src-cuda init.cu)
CUDA_ADD_LIBRARY(cugvnn MODULE ${src-cuda})
TARGET_LINK_LIBRARIES(cugvnn luaT THC TH)
IF(APPLE)
  SET_TARGET_PROPERTIES(cugvnn PROPERTIES
    LINK_FLAGS "-undefined dynamic_lookup")
ENDIF()


### Torch packages supposes libraries prefix is "lib"
SET_TARGET_PROPERTIES(cugvnn PROPERTIES
  PREFIX "lib"
  IMPORT_PREFIX "lib")

INSTALL(TARGETS cugvnn
  RUNTIME DESTINATION "${Torch_INSTALL_LUA_CPATH_SUBDIR}"
  LIBRARY DESTINATION "${Torch_INSTALL_LUA_CPATH_SUBDIR}")

INSTALL(
  FILES
  ${luasrc}
  DESTINATION "${Torch_INSTALL_LUA_PATH_SUBDIR}/cugvnn")
